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Alstom has completed the installation of its offshore wind turbine, the 6 MW Haliade 150, the largest offshore wind turbine ever installed in sea waters.

Located off Ostend harbour at the Belwind site in Belgium, the turbine has a 150 m rotor (with blades stretching 73.50 m), and a reported yield 15% better than existing offshore turbines, enabling it to supply power to the equivalent of about 5,000 households.

This follows successful tests performed on the first Haliade 150 commissioned in March 2012 at Le Carnet site in France, which successfully obtained in May 2013 the IEC (International Electrotechnical Commission) power performance measurement (power curve). This installation will help confirm how the machine behaves within the offshore environment.

Alstom's turbine features a 61 m jacket top of pillars which have been sunk to a depth exceeding 60 m. In all, the nacelle towers at a height of over 100 m above sea level. The overall weight of the turbine and its structure totals 1,500 tonnes.

The Haliade 150 operates without a gearbox, using direct drive. Due to its permanent-magnet generator, there are fewer mechanical parts inside the device, making it more reliable and thus helping to reduce operating and maintenance costs. It features Alstom’s Pure Torque design, which protects the generator by diverting unwanted mechanical stress towards the tower.

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